package view;

/*
 * Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle or the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

import javax.swing.*;

import java.awt.*;
import java.awt.event.*;

/**
 * Component to be used as tabComponent; Contains a JLabel to show the text and
 * a JButton to close the tab it belongs to.
 * 
 * @author Oracle and/or affiliates
 */

public class ButtonTabComponent extends JPanel {
	private static final long serialVersionUID = 1L;
	private final JTabbedPane pane;

	public ButtonTabComponent(final JTabbedPane pane) {
		// Remove default FlowLayout' gaps
		super(new FlowLayout(FlowLayout.LEFT, 0, 0));
		if (pane == null) {
			throw new NullPointerException("TabPane is null");
		}
		this.pane = pane;
		setOpaque(false);

		// make JLabel read titles from JTabbedPane
		JLabel label = new JLabel() {
			private static final long serialVersionUID = 1L;

			public String getText() {
				int i = pane.indexOfTabComponent(ButtonTabComponent.this);
				if (i != -1) {
					return pane.getTitleAt(i);
				}
				return null;
			}
		};

		add(label);
		// add more space between the label and the button
		label.setBorder(BorderFactory.createEmptyBorder(0, 0, 0, 5));
		// tab button
		JButton button = new TabButton();
		add(button);
		// add more space to the top of the component
		setBorder(BorderFactory.createEmptyBorder(2, 0, 0, 0));
	}

	/**
	 * Creates a tab with a button to add additional tabs to the tabbed pane. 
	 * 
	 * @author Oracle and/or affiliates
	 *
	 */
	private class TabButton extends JButton implements ActionListener {

		private static final long serialVersionUID = 1L;
		private static final int size = 17;

		public TabButton() {
			setPreferredSize(new Dimension(size, size));
			setToolTipText("Close Tab");
			// No need to be focusable
			setFocusable(false);
			setBorder(BorderFactory.createLineBorder(Color.gray));
			setBorderPainted(true);

			addMouseListener(buttonMouseListener);
			setRolloverEnabled(true);
			// Close the proper tab by clicking the button
			addActionListener(this);
		}

		public void actionPerformed(ActionEvent e) {
			int i = pane.indexOfTabComponent(ButtonTabComponent.this);
			if (i != -1) {
				pane.remove(i);
			}
		}

		// draw the cross
		protected void paintComponent(Graphics g) {
			super.paintComponent(g);
			Graphics2D g2 = (Graphics2D) g.create();
			// shift the image for pressed buttons
			if (getModel().isPressed()) {
				g2.translate(1, 1);
			}
			g2.setStroke(new BasicStroke(2));
			g2.setColor(Color.BLACK);
			if (getModel().isRollover()) {
				g2.setColor(Color.pink);
			}
			int delta = 6;
			g2.drawLine(delta, delta, getWidth() - delta - 1, getHeight()
					- delta - 1);
			g2.drawLine(getWidth() - delta - 1, delta, delta, getHeight()
					- delta - 1);
			g2.dispose();
		}
	}

	/**
	 * Listens for click on the create new tab button
	 */
	private final static MouseListener buttonMouseListener = new MouseAdapter() {
		public void mouseEntered(MouseEvent e) {
			Component component = e.getComponent();
			if (component instanceof AbstractButton) {
				AbstractButton button = (AbstractButton) component;
				button.setBorder(BorderFactory.createLineBorder(Color.darkGray));
			}
		}

		public void mouseExited(MouseEvent e) {
			Component component = e.getComponent();
			if (component instanceof AbstractButton) {
				AbstractButton button = (AbstractButton) component;
				button.setBorder(BorderFactory.createLineBorder(Color.gray));
			}
		}
	};
}
